`using` in `for` is not highlighted as keyword

[EienMiku]

Checklist

• This problem exists even with the setting "C_Cpp.enhancedColorization": "Disabled"

The code with a problem is:

for (using a = int; ;);

Detail for this grammer could be found in https://wg21.link/P2360R0 , which is now part of C++23.

It looks like:

The theme is Bluloco Light Italic.

It should look like:

using in for should be highlighted like using above.